Radial drill arm



Jan. 20, 1925.

D. C. KLAUSMEYER RADIAL DRI LL ARM Filed April 4, 1923 2 Shee'ts-Sheet l @MQW ATTORNEY Jan. 20;1925.

D. C. KLAUSMEYER RADIAL DRI LL ARM Filed April 4, 1923 wlTNEss i @2% iin/M ATTORNEY Patented ,lar., 2G,

DAVID C. 'KLAUSMEYER, CINCINNATI, OHIO, ASSIGNOP. TG THE CINCINNATI BICK- FORD TOOL CMPANY, OF GNCINNJLTI, OHIO, CORE'GB-ATION OE OHIO.

.Lil-)IAL DRILL ARIE.

Application filed April 4, 1923.

Be it known that I, Dif-ivm C. Knutsarnrnn, a citizen of the United States, and residing at ICincinnati, in the count),Y of Hamilton and State of Ohio, have invented a new and Improved Radial Drill Arm, of which the following specification is a full disclosure rlhis invention relates to radial drills, and has for its primary object an improved -structure of the radial arms for such drills, Iand also improvements in the structure of the heads mounted thereon.

In adial drills for heavy service, such radial-arms are massive members, (some times reaching a length of from sii; to ten feet) and in order to provit e a structure as light as possible consistent with the requisite strength, it is customary to form the radial-arn'i as a holloiv casting. In forming these castings a mold is employed having cores supported laterally from the ivalls of the mold at a multiplicity of points, forming holes in the sides of the arm through Which the cores are removed, these holes remaining in the finished arm as so many regions of Weakness, and detracting from the neat appearance of the arm.

The objective of this invention is to produce a radial-arm-casting free from the weakening core-holes, and constituting vwhen linished an arm-structure of greatly increased stability, capable of resisting the torsional strains to Weich these arms are subjected in use, the linishcd arm being also much neater in appearance by reason of its uninterrupted contour.

For effecting the above improvement, a mold for casting such raidial arms is provided ivith a core-portion, or preferably a plurality of core-portions, extending substantially parallel with the longitudinal axis of the arm, to produce a casting having a cross-section a plurality of parallel chambers, ivith intervening longitudinal partitions, for the salte of strength.

Each such lengthwise core-portion is supported by the Walls of the mold at the region `'which forms the outer end of the radialarm, so that in the castingY there Will be formed holes of asize adequate for the removal therethrough of the core-portions, but negligible in their effect upon the strength and appearance of the nished arm,-

Serial No. 629,853.

The above-described longitudinal coreportion or portions are preferably formed in connection With a transverse core-member at the other end of the mold for the radialarm, at the region of the mold Where is to be formed the so-called barrel of the arm, i. e. the sleeve-like part that is fitted eventually upon the ujn'ight column of the machine, this connection between the length- Wise core-portions and the large barrel-core yielding an extremely solid and advantageous support for the lengthwise core-portions at their inner ends, and not resulting in the formation of any exterior orifice in the casting, as this connection betiveen the core-portions occurs Within the region at ivhich the radial-arm springs from its barrel, the longitudinal chambers merging respectiif'ely into the barrel-bore.

Another important object of this invention is to improve the mode of mounting, upon such a radial arm, the sliding head which carries the drill, to provide for improved alignment of the nead with the arm, greater ease of movement of the head along the arm, and increased stability of the head upon the arm, these objects being accomplished by forming the arm and head With a main bearing of improved structure.

Ordinarily, the bearings between the radial-arm and its sliding head comprise the imtin-l'iearing to the improvement of which the present invention is directed. and an auxiliary-bearing which may, and preferably will, be of any Well-known or suitable structure ris heretofore constructed, the main-bearing' between the radial-arm and sliding-head is formed with co-operating front vertical bearing-surfaces on the arm and head respectively, also tapered loiver bearing-surfaces on the arm and head respectively, and upper, horizontal surfaces on the arm and head respectively, With a narrow guiding arrangement including a taper-gib, interposed between the aforesaid horizontal surfaces, and which performs the double duty of sustaining` the Weight of the head, and oft' cramping the vertical bearing-surface of the head against that of the arm, through the Wedging action of the co-operating apered bearing-surfaces.

The accurate formation. of these tapered surfaces has constituted indispensable A guiding member heretofore used, the mainbearings comprising a plurality of horizontal bearing-regions, which are designated herein yas the upper main bearing and the lower ina-in bearing respectively; also a plurality of vertical bearings, which are designated as the.' ront main bearing and thefkrear main bearing respectively; and to co-,operate therewith a. plurality of adn justable taper-gibs or narrow guide mem- CII ,bers ,are provided, with means to secure them in adjusted position, and which are designated as the primary-guide and the secondary guide;7 respectively, using these Vexpressions forthe sake of brevity and without technical limitation.

lThe bearing-surfaces on the sliding-head engage the rectangular-guiding-member of the arm on portions of four sides, so that the aggregate area of the main-bearings is greater than that of the usual main-bearings embodying a tapered structure, and yields greater stability to the head, while a more perfect alignment of the head on the arm is secured .by the plural guide-members, the

primary guide being interposed between the head and arm at the `region of the upper horizontal main bearing-portion, serving to sustain the weight of the head, and also `to' maintain both the upper Aand lower main horizontal bearing-portions in snugly-fitting relation, while the secondary guide -is interposed ybetween the head and the arm between the front and the rear main vertical bearing-portions, and serves to maintain both .the front and rear `main vertical bearing-,portions in snugly-fitting relation, relieving the primary-guide of the duty of any vertical alignment, so that the sliding motion .of ythe head on the arm is accomplishedinore,easily than in existing structures, the improved arm and head structure thus effectingthe important purposes which ,this kinvention V,has been devised to accomsplisli,y asabove set forth.

objects and advantages lwill be in part indicated in the following description vin part rendered apparent there-from in connection with the annexed drawings,

' of which To e-nable others skilled in the art so fully to apprehend the underlying features hereof ythat they may embody the-same in thev various ways contemplated by this invention, drawings depicting apreferred typical construction have been anneXedas a part of this disclosure and, in-such drawings, like characters of reference denote corresponding parts throughout all the views,

Fig. 1 shows in front elevation a radialarm, with its sliding-head in place thereon. 2 is a vertical section on the line 2-2 of Fig. 1, and Fig. 2a isl anzenlarged fragmentary detail view thereof.V Fig. 3 is a plan view of the radial arm, isolated. Fig.

-4 is a longitudinal, verticalsection on the line 4-4 of Fig. 3. VFig. 5 is a transverse, vertical sectionvoii the line 5 5 of F ig, 4. Referring to the drawings, it will be'seen that the radial-arm comprises a ,barrelport tion 1 tobe fitted uponthe usual rupright column of a radial drill, Vand an arm-portion 2 which extends from'the barrel and ser-ves as thesupporting member for the drill-head mounted slidingly thereon, the barrelporv tion being shown as of-well-lrnown construction in its general arrangements, having a bore 4 to receive the column, and being split at 5, with lugs .6 to receive suitable means for securing the radial-arm in adjusted position upon itssupporting column.

The arni-portion 2 is shown as a hollow structure, divided longitudinally by lengthwise extending partitions 7 into a plurality of longitudinal chambers 8, 9, 10A and 11 open respectively at their outer ends, and of which several vare-shown as communicating at their inner ends with bore 4 of the barrel ,1, the exterior lateral walls 12 of the arm being substantially uninterrupted in contour and thusfree from the core-holes which weaken and disflgure radial-arms Yas constructed heretofore.

The above improved structure may be produced by any suitable method, and as an advantageous method of Aformation use may be made of a mo-ld having a plurality of longitudinz-il core-members corresponding to the longitudinal chambers 8, 9, 1() and 11, these longitudinal core-members being supported at their outer ends by the walls of the mold at regions adjacent tothe outer openings 13, 14, 15 and 16 of the chambers, through which the material .of the cores may be removed. At their inner ends the cores may be supported by any suitable means, and in the instance of the cores for the Vchambers 9, 10 and 1l it will be found advantageous to support the cores from the transverse core-member used to form the barrel 1, which is essentially of substantial thickness and will afford ample support to the longitudinal core-members. By this mode of formation a hollow arm is produced of light structiuc by freason of its longitudinal chambers, but so strengthened by its innerl partitions, and by having exterior walls of uninterrupted contour, that it is much better fitted, than are existing radial-arms, to sustain the torsinal strains to which such arms are subjected in use, and it presents a much neater appearance with its uniformly continuous lateral walls than do the existing arms with their unsightly core-holes.

Referring to Figs. l, 2, and of the drawings, 'it will be seen that the supporting member Q of the radial arm is provided with a plurality of longitudinal bearings 17 and 18, the bearing 17 constituting the main longitudinal bearing of the arm, while the bearing 18 is an auxiliary longitudinal bearing and may be of any suitable character, being shown as of a well-known type that does not require special description, it being suiiicient to note that it co-operates with a bearing surface 19 upon the drill-head 3, as shown in Fig. 2, the head being provided with a retaining` member 20, secured thereto by suitable means, not shown.

In accordance with an important object of this invention, which is to provide better alignment of the head 3 upon the arm 2, increased stability thereof, and greater ease oit sliding` movement, provision is made by this invention for a. main bearing of greater area than is found in the main bearings of existing radial arms which employ a tapered lower bearing surface as part of the main bearings.

In the improved structure illustrated, the main bearing is formed with a plurality of horizontal bearing surfaces, of which the upper horizontal main bearing surface is designated by the reference character 2l and the lower bearing surface by the numeral QQ. and also has a plurality of vertical bearing surfaces,` of which the front surface is indicated at Q7 and the rear surface at 34, these surfaces together forming a series of rectangular lock-guiding bearings. The head 3 is shown as provided with main bearing surfaces corresponding respectively to the above main bearing surfaces, and comprises an upper bearing surface 25 corresponding to the arm surface 2l, a lower ho 1izontal bearing surface 26 corresponding to the arm bearing surface 22, a vertical bearing surface 27 corresponding to the arm bearing surface Q4 and a bearing portion 28 corresponding to the rear vertical arm' bearing surface 34, the above mentioned main bearing portionsupon the head engaging the rectangular main bearing portions of the arm on parts of four of its sides, so that the aggregate area of these bearings is considerably greater than that of the area of a main bearing employing lower tapered main bearing surfaces as used in existing radial arms of this type. There will preferably be, a slight clearance between the arm and head along the vertical region 23.

ln accordance with another object of this invention, there is provided a plurality of guides, comprising' a primary guide 29 and a secondary guide 30, the primary guide 29 being interposed between the head 3 and arm Q at the region of the upper horizontal bearing, where it will be seen in Fig. 2 between the surfaces 2l and Q5, serving to sustain the weight of the head and also to maintain in snugly fitting relation the surfaces 22 and 26 composing both the upper and lower main horizontal bearings.

The secondary-guide 30 is shown as interposed between the rear vertical bearing surfaces 24 and 28 and serves to maintain in snugly fitting relation both of the vertical main bearings, holding the surface 27 of the head against the surface 9A of the gib, and the surface Q8 of the head against the surface 34 of the arm. The above guide members 29 and 30 may be of any suitable material and construction and as one convenient form of structure they are shown as respectively comprising narrow taper gibs provided with adjusting screws 31 and 32 respectively.

It will, therefore, be seen that this invention provides a radial arm for radial drills, comprising an extended supporting member and a head mounted slidingly thereon, said supporting member being provided` with main longitudinal bearings comprising upper and lower horizontal bearing portions and front and rear vertical bearing portions, and said slidinghead having main horizontal and vertical bearing portions corresponding respectively with said main bearing portions on said supporting member, and a plurality of narrow guides comprising a primary guide interposed between said supporting member and head at the region of said upper horizontal main bearing portions, to maintain said upper and lower horizontal main bearing surfaces on said supporting member and head in snugly titting` relation, and a secondary-guide interposed between said supporting-member and head between the front and rear vertical main-bearing-portions, to maintain said front and rear vertical main-bearing-surfaces in snugly fitting relation, said primary and secondary guides including respectively an adjustable taper-gib and means to secure the same in adjusted position, and said main bearing-surfaces on said supportingmember constituting a structure having` rectangular bearing-surfaces, and engaged on portions of four sides by said bearingsurfaces on said head. i

The rectangular loclrguidinglbearing thus 'formed ha-sconsiderably greater aggregate area than the conventional bearings with a tapered lower surface, and accordingly the sliding-head is maintained in more accurate alignment with the arm, moves more easily thereon, and has greatly increased :stability in its relation to the arm.

VVitliout further analysis, the foregoing will so'ffully reveal the gist of this invention that others can, by applying current knowledge', readily adapt it for various utilizations Fby retaining one or more of the essential characteristics of either' the generic or'speciiic aspects of this invention, and, therefore, such adaptations should be, and are intended to be, `c omprehended within the meaning and range ofiequivalency of the following claims.

Having `thus revealed this invention, 1 claim as'new and desire to secure the following combinations and elements, or equivalents thereof, by Letters Patent of the United States: e

V1. A I radial-arm for radial drills, said arm comprising a unitary structure provid- 4ing afbearing` end and a hollow cellular' arm- -portion extending therefrom; said vbearing end of the arm being adapted to engage a suitable support for the arm, said cellular arm-portion having interior partitions in the nature of reinforcements and subdividing the interior into several Chambers, the exterior 'lateral walls vof said cellular armportion being free from core-holes and thereby continuous and uninterrupted.

2. A radial-'arm for radial-drills, said arm comprising a structureihav'ing a transverse barrel-portion'and an arm-portion with a plurality of longitudinal chambers separated by longitudinal partitions.

3. A radial-arm for radial-drills, said arm comprising' va unitary structure having a transverse barrel-portion and an arm-portion with 'a' plurality ofv longitudinal chambers-separated by longitudinal partitions, theexterior-lateral walls of said arm-portion vbeing substantially uninterrupted.

4. A radial-arm for radial-drills, said 'arm Comprising a unitary structure having` a transverse barrel-portion with abarrel-'bore .and an'arm-portion with a pluralityV of `longitudinal chambers opening into said barrelbore and separated by longitudinal partitions.

`5. Afra.clial4a1m for radial-drills, s'aid arm comprising an extended supporting-member anda head mounted'slidingly thereon, said supporting member being provided auxiliary and with main longitudinal bearings said m'ai-n bearing comprising a plurality of horizonta'l bearing-portions and a plurality of Aspaced vertical bearing-portions, and said slidinghead having horizontal and vertical bearing-portions correspondi'ng respectively *withsaidi ma'in bearing-portions on said' sup- :porting-member, the vertical bearing kvportion of the head extending between the vertical bearings of the arm.

6. A radial-arm for radial-drills, said arm com risinO an extended su o1tin0-1ne1nber and a-head mounted slidingly thereon, said auxiliary and main longitudinal bearings 'said main bearing comprising a plurality of horizontal bearing-portions and a plurality of opposed and facing vertical bearing-portions, and said sliding head having horizontal'and vertical bearing-portions corresponding respectively with said main bearing-portions on said supporting-member, said main bearing-surfaces on said supporting-member constituting bearings 'substantially rectangular in cross-section,andengaged on portions `of four sides by said bearing-surfaces on said head, the vertical bearing portions of the head extending between the vertical bearings of the arm.

`7. A radi'al-arm for radial-drills, said arm comprising an extended supporting-member and ya headmounted slidingly thereon, ysaid supporting member being provided with auxiliary and main longitudinal bearings rsupporti-ng member Abeing' provided with said main bearing comprising upper and Y said lmain bearing comprising upper and lower external horizontal bearing-portions, and front and rear internalvertical bearingportions, and said lsliding head having horizontal and vertical bearing-portions correspondingre'spectively withsaid main bearking-portions o'n said supporting member, said main bearing-surfaceson saidl supporting-member being engaged on portions of four sides by said 'bearing-surfaces on said head, vtwo of the bearing surfaces of said head projecting between and being in contact with the intern'al bearing surfaces of said arm. i

9. A radial-arm for radial drills, said arm Y comprising an extended supporting-member and a vhead mounted slidingly thereon, said supporting memberl being provided Vwith auxiliary land main longitudinal bearings, said main bearing comprising a plurality of horizontal bearing portions contacting with bearing portions provided by said head to prevent vertical movement between the two;

and a plurality of horizontally spaced ver- In Witness whereof, I helennto subscribe tical walls provided hy the loWeI` portion of my nzune, as attested by the two subscribing l@ said nlal bearing and oonscilztntng a gudwitnesses. Way, sai head benO rovi ed with a gui e l projecting into sedcgdeway and engaging DAVID C' KLUSMEYER' said Vertical Walls to prevent :relative hor- Witnesses:

zontal movement between said head and said C. C. SLETE,

arm. i HILDA HERBERS.

Certificate of Correction.

It is hereb7 certied that in Letters Patent No. 1,523,596, granted January 20, 1925, upon the application of David C. Klausrneyer, of Cincinnati, Ohio, for an improvement in Radial Drill Arms, errors appear in the printed specification requiring correction as follows: Page l, line 43, for the article ai, second occurrence, read in; page 3, line G, for the misspelled Word torsinal read torsional; page 4, line 58, claim 5, after the Word provided insert the Word with, and line 59, strike out the Word with and that the said Letters Patent shouldbe read with these corrections therein that the saine may conform to the record of the case in the Patent Oliice.

Signed and sealed this 17th day of February, A. D. 1925.

[SEAL] KARL FENNING,

Acting (Mmmz'ssz'oner 07 Patents', 

